<template>
  <div>
    <p>请选择你要购买的书籍</p>
    <ul>
      <li v-for="(itme, index) in arr" :key="index">
        {{ itme.name }}
        <button @click="itme.count++">买</button>
      </li>
    </ul>
    <table border="1" width="500" cellspacing="0">
      <thead>
        <tr>
          <th>序号</th>
          <th>书名</th>
          <th>单价</th>
          <th>数量</th>
          <th>合计</th>
        </tr>
      </thead>
      <tbody>
        <tr v-for="(itme, index) in arr" :key="index">
          <td>{{ index + 1 }}</td>
          <td>{{ itme.name }}</td>
          <td>{{ itme.price }}</td>
          <td>{{ itme.count }}</td>
          <td>{{ itme.price * itme.count }}</td>
        </tr>
      </tbody>
    </table>
    <p>总价格为:{{ sum }}</p>
  </div>
</template>

<script>
export default {
  // name: "",
  data() {
    return {
      arr: [
        {
          name: "水浒传",
          price: 107,
          count: 0,
        },
        {
          name: "西游记",
          price: 192,
          count: 0,
        },
        {
          name: "三国演义",
          price: 219,
          count: 0,
        },
        {
          name: "红楼梦",
          price: 178,
          count: 0,
        },
      ],
    };
  },
  computed: {
    sum() {
      return this.arr.reduce((sum, itme) => {
        return (sum += itme.price * itme.count);
      }, 0);
    },
  },
};
</script>

<style></style>
